High temperature superconducting low power receiver protector/cl

Details High temperature superconducting low power receiver protector/cl High temperature superconducting low power receiver protector/cl

1996-09-30

1999-03-02

Le, Thanh Cong

Telecommunications

Receiver or analog modulated signal frequency converter

With protection circuit for receiver circuit

4552351, 4552421, 333 81A, H04B 106, H04B 116

Patent

active

058783342

ABSTRACT:
The present invention provides for a low power receiver protector and stepped attenuator for conditioning a received input signal within a microwave receiver front end. The low power receiver protector includes a detector for generating a surge signal in response to the received input signal exceeding a predetermined threshold, a delay line for delaying the received input signal for fixed duration, and a limiter for reducing the voltage of the received input signal in response to the generation of the surge signal. The stepped attenuator includes a plurality of cells each having an attenuation transmission path which includes an attenuator for providing a predetermined amount of attenuation of the received input signal. Each attenuation transmission path, bypass transmission path and delay line comprise a high temperature superconductor to provide minimal loss and reduced size.

REFERENCES:
patent: 4138637 (1979-02-01), Weinert
patent: 4169219 (1979-09-01), Beard
patent: 5036527 (1991-07-01), Halim et al.
patent: 5128636 (1992-07-01), Furutani et al.
patent: 5282842 (1994-02-01), Buck et. al.
patent: 5472935 (1995-12-01), Yandrofski et al.
patent: 5678214 (1997-10-01), Azuma
"What's New With Receiver Protectors?" By Steven N. Stitzer Microwave Magazine, Jan. 1976.
"An Overload Protected Low-Noise X-Band FET Amplifier" by E.C. Niehenke and T.E. Steigerwald, presented at the 1983 IEEE MTT-S International Microwave Symposium.

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